JPH102373A - Liquid filled bush - Google Patents

Abstract

(57) [Problem] To provide a liquid sealing bush capable of effectively damping a load acting in a main load input direction and a load in a direction orthogonal thereto. A Connect the outer tube 11 and the inner cylinder 12 of an elastic body 15, the main liquid chamber R ₁ between the elastic member 15 and the outer cylinder 11, R
_2, it forms a circumferentially continuously provided the auxiliary liquid chamber R _3, R _4, causing them to communicate with the orifice O ₁ ~ O _3. When high loads in X-X 'direction is input, the main liquid chamber R _1, the liquid volume of the R ₂ is extruded by shrinking through the orifice O ₁ ~ O _3, the damping force by the resistance at that time Occurs. Under the input of the load in the XX 'direction, Z-
When the load in the Z direction is input, the main liquid chamber R _1, shrinking auxiliary liquid chamber R _3, a volume of R ₄ adjacent to R _2, extruded liquid passes through the orifices O ₁ ~ O ₃ This generates a damping force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic body disposed between an outer cylinder and an inner cylinder having axes parallel to each other, and a plurality of liquid chambers formed so as to face the elastic body. And a liquid-filled bush that buffers the relative movement of the outer cylinder and the inner cylinder by resistance of the liquid passing through the orifice.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional liquid sealing bush. As is clear from the figure, the liquid-filled bush B includes an outer cylinder 01 and an inner cylinder 02 that share the axis L, and a collar 03 and an outer cylinder 01 fitted on the outer periphery of the inner cylinder 02.
The first elastic body 04 for connecting the space and the outer cylinder 01
A pair of second elastic bodies 06,06 coupled via
And by, it is made liquid chamber R ₅ and the liquid chamber R ₆ strokes. The liquid chamber R ₅ and the liquid chamber R ₆ are connected to each other by two orifices O _5, O _5.

[0003] When the outer cylinder 01 and inner cylinder 02 first elastic member 04 by the input load is deformed relatively moved in the arrow X-X 'direction, scaling the volume of the liquid chamber R ₅ and the liquid chamber R ₆ are alternately Then, the liquids in the liquid chambers R ₅ and R ₆ move back and forth through the orifices O ₅ and O _5, and the load is damped by the resistance of the liquid generated at that time. When an even larger load is input and the outer cylinder 01 and the inner cylinder 02 relatively move relatively,
When the first elastic body 04 comes into close contact with the one second elastic body 06, an increase in the relative movement amount of the outer cylinder 01 and the inner cylinder 02 is restricted, and a stopper function is exhibited.

[0004]

FIG. 9 shows an outer cylinder 0 of a liquid-filled bush B provided at the end of a suspension arm when a tire of an automobile gets over road irregularities.
6 is a graph showing characteristics of a relative displacement amount generated between the first cylinder and the inner cylinder. X which is the longitudinal direction of the suspension arm
When a load is input in the direction, X of the outer cylinder 01 and the inner cylinder 02
The relative displacement in the direction gradually increases (see the area a and the area b). When the relative displacement amount in the X direction approaches the limit, the outer cylinder 01 and the inner cylinder 02 are relatively displaced in the Z direction orthogonal to the X direction due to a load that cannot be absorbed (see region c).

[0005] Although the above-mentioned conventional liquid-filled bush B is effective for damping the load in the XX 'direction, there is a problem that the load in the ZZ' direction perpendicular to the above cannot be effectively damped. Was.

The present invention has been made in view of the above circumstances, and provides a liquid sealing bush capable of effectively damping a load acting in a main load input direction and a load perpendicular to the main load input direction. The purpose is to:

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an elastic body is disposed between an outer cylinder and an inner cylinder having axes parallel to each other. A plurality of liquid chambers formed so as to face each other through an orifice, and a liquid sealing bush in which relative movement of the outer cylinder and the inner cylinder is buffered by resistance of a liquid passing through the orifice. A main liquid chamber whose volume expands and contracts when a large radial load is input between the cylinders, and is provided in a circumferential direction with respect to the main liquid chamber, and is arranged in a circumferential direction under the input of the large radial load. A sub-liquid chamber whose volume expands and contracts when a load is applied thereto, and an orifice which connects the main liquid chamber and the sub-liquid chamber to each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. FIG. 1 is a side view of a suspension arm provided with a liquid sealing bush, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 2-2 of FIG. 3, FIG. 3 is a sectional view taken along line 3-3 of FIG.
FIG. 4 is an operation explanatory diagram when a radial load is input, and FIG. 5 is an operational explanatory diagram when a circumferential load is input.

In FIG. 1, reference numeral 1 denotes a suspension arm (leading arm or trailing arm) of an automobile. A liquid sealing bush B fixed by press-fitting to an annular support portion 3 formed at one end of the arm body 2 of the suspension arm 1 is provided with a pair of mounting brackets 6 provided on the vehicle body side with bolts 4 and nuts 5 penetrating therethrough. , 6 fixed. A U-shaped support portion 7 is formed at the other end of the arm body 2, and a liquid sealing bush B fixed by press-fitting to an annular support portion 8 formed at the tip of the knuckle arm penetrates the inside. It is fixed to the support part 7 with bolts 9 and nuts 10 to be fixed. Since the two liquid-encapsulated bushes B, B have substantially the same structure, the structure will be described using the liquid-enclosed bush B fixed to the mounting brackets 4, 4 on the vehicle body side as an example.

As shown in FIGS. 2 and 3, the liquid-filled bush B includes a large-diameter outer cylinder 11 and a small-diameter inner cylinder 12 concentrically arranged inside the outer cylinder 11 while sharing an axis L. Is provided. An elastic body 15 is fixed to the outer periphery of the three inner collars 13, 14, and 14 fixed to the outer periphery of the inner cylinder 12 by press fitting by baking. A substantially annular outer collar 16 fixed to the outer periphery of the elastic body 15 by baking is attached to the outer cylinder 11.
And fixed by caulking.

The liquid-filled bush B mainly includes
The load in the direction of the arrow XX 'is applied from the suspension arm 1.
Is entered. It is located on the input line XX 'of the load.
As described above, between the outer circumference of the elastic body 15 and the inner circumference of the outer cylinder 11, the first
Liquid chamber R₁And the second liquid chamber R_TwoIs defined, and the first liquid chamber R
₁Two third liquid chambers R adjacent to both circumferential sides of_Three, R _Three
Is defined, and the second liquid chamber R_TwoOn both sides in the circumferential direction
Two adjacent fourth liquid chambers R_Four, R_FourIs defined. First
Liquid chamber R₁And the third liquid chamber R_Three, R_ThreeIs a pair of first orifices
Su O₁, O₁And the second liquid chamber R_TwoAnd the second
4 liquid chamber R_Four, R _FourIs a pair of second orifices O_Two, O_Two
Connected via Further, the adjacent third liquid chamber R_Threeas well as
Fourth liquid chamber R_FourThe third orifice O_ThreeThrough
Connected.

First liquid chamber R₁And the second liquid chamber R_TwoOf the present invention
A third liquid chamber R_Three, R _ThreeAnd the fourth liquid chamber
R_Four, R_FourConstitutes the auxiliary liquid chamber of the present invention.

[0014] Inside the elastic member 15, the first space S ₁ slit extending so as to block between the inner cylinder 12 and the first liquid chamber R ₁ and the third liquid chamber R _3, R ₃ is formed and the second space S ₂ slit extending so as to block between the second liquid chamber R ₂ and the fourth liquid chamber R _4, R ₄ and the inner cylinder 12 is formed.

Next, the operation of the first embodiment having the above configuration will be described.

The load input from the suspension arm 1 to the liquid-filled bush B as the vehicle travels is shown in FIG.
In the region, that is, the outer cylinder 11 of the liquid sealing bush B
When a relatively small load acts in the direction of arrow X in FIG. 2, the volume of the first space S ₁ is reduced and the second space S ₁ is reduced.
_The elastic member 15 is deformed so as to increase the volume to ₂ , and a damping force is generated. At this time, since the elastic members 15 radially outside the first space S ₁ and the second space S ₂ are hardly deformed, the volumes of the first liquid chamber R ₁ to the fourth liquid chamber R ₄ do not change.
The liquid does not pass through the _first to third orifices O ₁ to O ₃ . In this manner, an arrow when X-X 'relatively small load direction is input, elastic so that the volume of the first space S ₁ and the second space S ₂ is scaled alternating member 1
5 is deformed, and a relatively small damping force corresponding to the input load is generated.

When the load input to the liquid sealing bush B increases to the region b in FIG. 9, that is, when a relatively large load acts on the outer cylinder 11 of the liquid sealing bush B in the direction of arrow X in FIG. the first liquid chamber volume of R ₁ radially outward of the first space S ₁ in the center portion of the first space S ₁ is collapsed reduced as shown in, the liquid of the first liquid chamber R ₁ is a After passing through one orifice O ₁ , O ₁ , it flows into the third liquid chambers R ₃ , R ₃ ,
From there, the third orifices O ₃ and O ₃ → the fourth liquid chambers R ₄ and R ₄ → the second orifices O ₂ and O ₂ → the second liquid chambers R ₂
Travel by route. At this time, a relatively large damping force corresponding to the input load is generated due to the resistance acting on the liquid passing through the _first to third orifices O ₁ , O ₁ , O ₂ , O ₂ , O ₃ , O _3. .

Now, when the load input to the liquid sealing bush B further increases and becomes a region c in FIG. 9, that is, in addition to the load in the arrow X direction, the load in the arrow Z direction is applied to the outer cylinder 11 of the liquid sealing bush B. Works, the first as shown in FIG.
The liquid chamber reduced the volume of the third liquid chamber R ₃ one of which is adjacent to R _1, first the liquid of the third liquid chamber R ₃ passes through the first orifice O ₁ flows upward in FIG 1 together flows into the liquid chamber R ₁ side, the third orifice O ₃ flows downward in FIG. 5
Passes through the fourth liquid chamber flows into the R ₄ side, the damping force commensurate with the load of the Z-direction by the resistance of the liquid generated during occurs.

Therefore, the main load input direction X-
While a large load is acting in the X 'direction, XX'
Even if a further load acts in the ZZ 'direction orthogonal to the direction, the load in the ZZ' direction can be effectively damped.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In FIGS. 6 and 7,
Members corresponding to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment.

The liquid-filled bush B of the second embodiment has a first
In addition to the first elastic body 15 corresponding to the elastic body 15 of the embodiment, two second elastic bodies 18 are provided. The outer periphery of the first elastic body 15 is fixed to the inner periphery of the substantially annular outer collar 16 by baking, and the outer collar 16 is
1 and fixed by swaging. A pair of arc-shaped support plates 17, 17 to which the outer circumferences of the second elastic bodies 18, 18 are fixed by baking are formed by a pair of circumferentially extending openings 16 ₁ , 16 formed in the outer collar 16.
₁ (See FIG. 6) Fixed so as to fit. Although the first elastic body 15 and the second elastic bodies 18 and 18 are formed as separate members, the outer surface of the first elastic body 15 and the inner surface of the second elastic bodies 18 and 18 partially contact each other. The outer cylinder 11 and the inner cylinder 12 are positioned concentrically (see FIG. 7).

The first elastic body 15, between the second elastic member 18 and the outer cylinder 11 and the fifth liquid chamber R ₅ and sixth liquid chamber R ₆ is defined, these fifth liquid chamber R ₅ and The sixth liquid chamber R ₆ is disposed on both sides of the axis L in the direction of the arrow XX ′. The fifth liquid chamber R ₅ and the sixth liquid chamber R ₆ are formed by a pair of third orifices O formed between the outer cylinder 11 and the outer collar 16.
₃ and O ₃ communicate with each other.

The pair of second elastic members 18 and 18 and the outer cylinder 11
During the first embodiment and the same first fluid chamber R ₁ and the second liquid chamber R ₂ is defined, these first liquid chamber R ₁ and the second liquid chamber R
_A pair of third liquid chambers R ₃ , R ₃ and fourth liquid chambers R ₄ , R ₄ are defined adjacent to each other. Then, the first liquid chamber R ₁
Are the third liquid chambers R ₃ , R 3 via the first orifices O ₁ , O _1.
3 , the third liquid chambers R ₃ , R ₃ communicate with the fifth liquid chamber R ₅ via the fourth orifices O ₄ , O ₄ ,
The second liquid chamber R ₂ is connected to the fourth orifice O ₂ , O ₂ via the fourth orifice O ₂ .
Communicating with the liquid chamber R _4, R _4, fourth liquid chamber R _4, R ₄ is communicated with the sixth fluid chamber R ₆ through a fifth orifice O _5, O _5.

Next, the operation of the second embodiment having the above configuration will be described.

[0025] When the relatively small load of arrows X-X 'direction to the suspension arm 1 is applied, the volume of the fifth liquid chamber R ₅ by the first elastic body 15 is deformed and sixth liquid chamber R ₆ alternately expands and contracts, and the liquid in the fifth liquid chamber R ₅ and the sixth liquid chamber R ₆ moves back and forth through the third orifices O ₃ , O _3. A relatively small damping force corresponding to the magnitude of the load input to the motor can be obtained.

The suspension arm 1 has an arrow X (or
When a large load acts in the X ') direction, the fifth liquid chamber R
_Five(Or sixth liquid chamber R₆) Of the central part disappears and
The outer surface of the first elastic body 15 and the inner surface of any one of the second elastic bodies 18
The first elastic body 15 presses the second elastic body
18 is deformed. As a result, the first liquid chamber R₁(Or the second liquid
Room R _Two) Volume is reduced and the liquid extruded from it
First orifice O₁, O₁(Or the second orifice O_Two,
O_Two) And the third liquid chamber R_Three, R_Three(Or the fourth liquid chamber R
_Four, R_Four), And from there the fourth orifice
O_Four, O_Four(Or 5th orifice O_Five, O_FivePass)
And the fifth liquid chamber R_Five(Or sixth liquid chamber R₆)
To the input load due to the resistance acting on the liquid
Large damping force is generated.

When the load input to the liquid sealing bush B further increases and becomes the region c in FIG. 9, that is, in addition to the load in the direction of the arrow X (or X '), the arrow Z is applied to the outer cylinder 11 of the liquid sealing bush B. When a load in the −Z ′ direction acts, the third liquid chamber R ₃ (or the second liquid chamber R ₂₎ adjacent to the first liquid chamber R _1.
The volume of one fourth liquid chamber R ₄ ) adjacent to the first orifice O ₁ and the fourth orifice O ₁ is reduced.
₄ (or second orifice O ₂ and fifth orifice O ₅ )
And flows into the first liquid chamber R ₁ and the fifth liquid chamber R ₄ (or the second liquid chamber R ₂ and the sixth liquid chamber R ₆ ), and due to the resistance of the liquid generated at that time, the arrow Z A damping force corresponding to the load in the −Z ′ direction is generated.

According to the second embodiment, X-
When a further load acts in the ZZ 'direction under the input of the load in the X' direction, the load in the ZZ 'direction can be effectively damped.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, the number of the first liquid chamber R ₁ to the fourth liquid chamber R ₄ is not limited to the embodiment and can be changed as appropriate. The application of the liquid-filled bush B of the present invention is not limited to supporting the suspension arm 1 of a vehicle.

[0031]

As described above, according to the first aspect of the invention, when a large radial load is input between the outer cylinder and the inner cylinder, the volume of the main liquid chamber expands and contracts, and the main liquid chamber expands and contracts. Liquid moves back and forth between the auxiliary liquid chamber via the orifice and a damping force is generated. When a load in the circumferential direction is input under the input of the large load in the radial direction, the volume of the sub liquid chamber expands and contracts, and the liquid in the sub liquid chamber moves between the main liquid chamber and the orifice. Damping force is generated. Accordingly, when the input load cannot be absorbed even when the outer cylinder and the inner cylinder are relatively displaced to the limit position in one direction, the remaining load is absorbed by the relative displacement of the outer cylinder and the inner cylinder in a direction orthogonal to the input load. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of a suspension arm having a liquid-filled bush.

2 is an enlarged sectional view taken along line 2-2 of FIG. 1 (a sectional view taken along line 2-2 of FIG. 3);

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is an explanatory diagram of an operation when a radial load is input.

FIG. 5 is an explanatory diagram of an operation when a circumferential load is input.

FIG. 6 is a view according to a second embodiment and corresponding to FIG. 3;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a cross-sectional view of a conventional liquid-filled bush.

FIG. 9 is a graph showing displacement characteristics between an outer cylinder and an inner cylinder of the liquid-filled bush.

[Explanation of symbols]

11 outer cylinder 12 inner cylinder 15 elastic body, first elastic body 18 second elastic body (elastic body) L axis O ₁ first orifice (orifice) O ₂ second orifice (orifice) O ₃ third orifice (orifice) O ₄ the fourth orifice (orifice) O ₅ fifth orifice (orifice) R ₁ first liquid chamber (main liquid chamber, liquid chamber) R ₂ second liquid chamber (main liquid chamber, liquid chamber) R ₃ third liquid chamber ( auxiliary liquid chamber, liquid chamber) R ₄ fourth liquid chambers (auxiliary liquid chamber, liquid chamber) R ₅ fifth liquid chamber (liquid chamber) R ₆ fifth liquid chamber (liquid chamber)

Claims (1)

[Claims] An elastic body (15, 18) is arranged between an outer cylinder (11) and an inner cylinder (12) having axes (L) parallel to each other, and faces the elastic body (15, 18). a plurality of liquid chambers formed in the (R ₁ ~R ₆₎ orifice (O ₁ ~
O ₅ ), and the relative movement of the outer cylinder (11) and the inner cylinder (12) is controlled by the orifices (O ₁ -O ₁ ).
The main liquid chamber (R ₁₎ whose volume expands and contracts when a large radial load is applied between the outer cylinder (11) and the inner cylinder (12) in the liquid-filled bush that buffers by the resistance of the liquid passing through O ₅ ). ,
R ₂ ) and the main liquid chambers (R ₁ , R ₂ ) are connected in the circumferential direction, and the volume expands and contracts when a circumferential load is applied under the input of the large radial load. the sub liquid chamber (R _3, R _4), the main liquid chamber (R _1, R ₂₎ and the auxiliary liquid chamber orifice communicating (R _3, R ₄₎ to each other and (O _1, O _2), the A liquid-filled bush characterized by comprising: